I'd like to get rid of Norton's AV on my mom's computer and replace it with Avast---but I'm not sure how to go about it. She has a setup where the internet is always on, so I need to know how to turn that off and back on again (I still have dialup myself, so I'm not familiar with cable hookups etc.), and also how to remove the Norton's completely.

You should be able to unplug the connection then remove norton av via add/remove programs.

Much better to use the Norton Removal Tool (http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2005033108162039)

Just sit back and let it remove every trace of Norton.

Thanks--I'll unplug the cable and use the Norton Removal tool.